Catching a water-type Pokemon is not easy unless if you are near any large bodies of water like lakes and oceans. If you can't find rare Pokemon on those areas you can always choose to evolve them. Water-type Pokemon can also be found near water related land marks like pools, beaches, rivers or small ponds.
'Pokemon GO: How to Catch Gyarados'
Catching a water type Pokemon like Gyarados is really difficult, but evolving it is easy, you'll just need 400 Magikarp candies. Magikarp has higher spawn rate at near bodies of water and it can easily be caught there.
Gyarados is one of the rarest Pokemon in "Pokemon GO," and obtaining 400 Magikarp candies is really a hard work, but if you aquire Gyarados it will be worth it. Gyarados is one of the strongest water type in "Pokemon GO." Go to our previous discussion to learn why Gyarados needs 400 candies to evolve.
'Pokemon GO: How to Catch Lapras'
According to Mobile & Apps, Lapras is also one of the rarest Pokemons. Lapras is water and ice-type Pokemon. You can't make any Pokemon to evolve to Lapras, so the only chance of obtaining Lapras is by catching it in the wild, but you will need a lot of Razz Berries and Pokeballs for this rare Pokemon.
'Pokemon GO: How to Catch Staryu, Starmie and Seadra'
Starmie is a water-psychic type hybrid, and can be evolved from Staryu. As with Horsea, it also needs 50 Staryu Candy to evolve into Starmie. Seahorse-like Pokémon Seadra can be evolved from its first form Horsea. The cute water-type Pokémon can be evolved into Seadra using 50 Horsea Candy.
There are many strong water type Pokemon in "Pokemon GO," but who is the strongest of them all? Ranked Boost has an entire list of Pokemon with their classifications and there rankings. Water type Pokemons that are considered class S are Gyarados, Poliwrath, Blastoise, Vaporeon and Lapras.
